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本文以双馈感应发电机(DFIG)为控制对象,采用先进的非线性控制方法,实现DFIG的高性能稳定控制。基于DFIG数学模型,建立了DFIG的Euler-Lagrange系统模型,并论证了DFIG的严格无源特性。根据交流励磁变速恒频风力发电系统的运行原理,针对风力负载时变未知的特性,利用本质上是非线性反馈控制的PBC方法,与自适应控制相结合,通过对控制目标的计算分析,设计出非线性无源性控制器,实现系统参数摄动情形下DFIG磁链、转速的渐近跟踪与控制。基于Matlab/Simulink搭建了双馈感应风力发电(DFIG)控制系统的仿真模型,实验结果证明:该方法实现简单,鲁棒性强,具有较优的静、动态特性,能有效抑制由风机电阻变化引起的跟踪误差。
In this paper, DFIG is the control object, and the advanced non-linear control method is adopted to realize the high-performance and stable control of DFIG. Based on the DFIG mathematical model, the Euler-Lagrange system model of DFIG is established and the rigorous passive characteristics of DFIG are demonstrated. According to the operation principle of AC excitation VSCF wind power generation system, in view of the time-varying unknown characteristics of wind load, PBC method which is nonlinear feedback control is used in combination with adaptive control. Through the calculation and analysis of control targets, Nonlinear passive controller achieves asymptotic tracking and control of DFIG flux linkage and rotation speed under perturbation of system parameters. The simulation model of doubly-fed induction wind power (DFIG) control system is established based on Matlab / Simulink. The experimental results show that the proposed method is simple, robust and has excellent static and dynamic characteristics. It can effectively suppress the change of resistance Caused tracking error.